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f(4)=-2.4+b. - masukkan ke persamaan
-5 =-8+b. - karena f(4) nya -5 jdi diganti f(4) nya dg -5
-5+8 =b - pindah ruaskan -8 ke -5 krn pindah tanda negatif jdi positif.
3 = b
semoga bermanfaat. gak ngerti?comment.